给子元素添加属性而不生成新的 XML 元素。

huangapple
go评论117阅读模式
英文:

Add attribute to the child without generating new XML element

问题

如何使用Go XML包创建这个XML呢？

  1. <Files><File width="200" height="100">somevaluehere</File></Files>

这比你想象的要困难，例如：

  1. type Video struct {
  2.     Files Files `xml:"Files"`
  3. }
  5. type Files struct {
  6.     Width  string `xml:"Width,attr"`
  7.     Height string `xml:"Height,attr"`
  8.     File   string `xml:",chardata"`
  9. }

输出结果是：

  1. <Video><Files Width="640" Height="480"><File>somevalue</File></Files></Video>

而我想要的是：

  1. <Video><Files><File Width="640" Height="480">somevalue</File></Files></Video>
英文:

How can I create this XML using the Go XML package?

  1. &lt;Files&gt;&lt;File width=&quot;200&quot; height=&quot;100&quot;&gt;somevaluehere&lt;/File&gt;&lt;/Files&gt;

It is harder than you may think, for example:

  1. type Video struct {
  2.     Files Files `xml:&quot;Files&quot;`
  3. }
  5. type Files struct {
  6. 	Width  string `xml:&quot;Width,attr&quot;`
  7. 	Height string `xml:&quot;Height,attr&quot;`
  8. 	File   string `xml:&quot;File&quot;`
  9. }

the output is:

  1. &lt;Video&gt;&lt;Files Width=&quot;640&quot; Height=&quot;480&quot;&gt;&lt;File&gt;somevalue&lt;/File&gt;&lt;/Files&gt;&lt;/Video&gt;

And I want:

  1. &lt;Video&gt;&lt;Files&gt;&lt;File Width=&quot;640&quot; Height=&quot;480&quot;&gt;somevalue&lt;/File&gt;&lt;/Files&gt;&lt;/Video&gt;

答案1

得分: 2

你想要将Video.Files渲染为<Video><Files><File>标签，因此在标签中指明这一点：

  1. type Video struct {
  2.     Files Files `xml:"Files>File"`
  3. }
  5. type Files struct {
  6.     Width  string `xml:"Width,attr"`
  7.     Height string `xml:"Height,attr"`
  8.     File   string `xml:",chardata"`
  9. }

并且你希望Files.File的值成为标签的字符数据，也在标签中指明这一点：

  1. type Files struct {
  2.     Width  string `xml:"Width,attr"`
  3.     Height string `xml:"Height,attr"`
  4.     File   string `xml:",chardata"`
  5. }

进行测试：

  1. v := Video{
  2.     Files: Files{
  3.         Width:  "640",
  4.         Height: "480",
  5.         File:   "someValue",
  6.     },
  7. }
  8. out, err := xml.Marshal(v)
  9. if err != nil {
  10.     panic(err)
  11. }
  12. fmt.Println(string(out))

输出结果为：

  1. <Video><Files><File Width="640" Height="480">someValue</File></Files></Video>

如果<Files>内部可能有多个<File>元素，我会将Video.Files定义为切片：

  1. type Video struct {
  2.     Files []File `xml:"Files>File"`
  3. }
  5. type File struct {
  6.     Width  string `xml:"Width,attr"`
  7.     Height string `xml:"Height,attr"`
  8.     File   string `xml:",chardata"`
  9. }

进行测试：

  1. v := Video{
  2.     Files: []File{
  3.         {
  4.             Width:  "640",
  5.             Height: "480",
  6.             File:   "someValue",
  7.         },
  8.         {
  9.             Width:  "320",
  10.             Height: "240",
  11.             File:   "otherValue",
  12.         },
  13.     },
  14. }
  15. out, err := xml.Marshal(v)
  16. if err != nil {
  17.     panic(err)
  18. }
  19. fmt.Println(string(out))

输出结果为：

  1. <Video><Files><File Width="640" Height="480">someValue</File><File Width="320" Height="240">otherValue</File></Files></Video>
英文:

You want Video.Files to be rendered into &lt;Video&gt;&lt;Files&gt;&lt;File&gt; tag, so indicate this in the tag:

  1. type Video struct {
  2. 	Files Files `xml:&quot;Files&gt;File&quot;`
  3. }

And you want the Files.File value to be the tag's char data, also indicate this in the tag:

  1. type Files struct {
  2. 	Width  string `xml:&quot;Width,attr&quot;`
  3. 	Height string `xml:&quot;Height,attr&quot;`
  4. 	File   string `xml:&quot;,chardata&quot;`
  5. }

Testing it:

  1. v := Video{
  2. 	Files: Files{
  3. 		Width:  &quot;640&quot;,
  4. 		Height: &quot;480&quot;,
  5. 		File:   &quot;someValue&quot;,
  6. 	},
  7. }
  8. out, err := xml.Marshal(v)
  9. if err != nil {
  10. 	panic(err)
  11. }
  12. fmt.Println(string(out))

Which outputs (try it on the Go Playground):

  1. &lt;Video&gt;&lt;Files&gt;&lt;File Width=&quot;640&quot; Height=&quot;480&quot;&gt;someValue&lt;/File&gt;&lt;/Files&gt;&lt;/Video&gt;

If there could me multiple &lt;File&gt; elements inside &lt;Files&gt;, I would make Video.Files a slice:

  1. type Video struct {
  2. 	Files []File `xml:&quot;Files&gt;File&quot;`
  3. }
  5. type File struct {
  6. 	Width  string `xml:&quot;Width,attr&quot;`
  7. 	Height string `xml:&quot;Height,attr&quot;`
  8. 	File   string `xml:&quot;,chardata&quot;`
  9. }

Testing it:

  1. v := Video{
  2. 	Files: []File{
  3. 		{
  4. 			Width:  &quot;640&quot;,
  5. 			Height: &quot;480&quot;,
  6. 			File:   &quot;someValue&quot;,
  7. 		},
  8. 		{
  9. 			Width:  &quot;320&quot;,
  10. 			Height: &quot;240&quot;,
  11. 			File:   &quot;otherValue&quot;,
  12. 		},
  13. 	},
  14. }
  15. out, err := xml.Marshal(v)
  16. if err != nil {
  17. 	panic(err)
  18. }
  19. fmt.Println(string(out))

Which outputs (try it on the Go Playground):

  1. &lt;Video&gt;&lt;Files&gt;&lt;File Width=&quot;640&quot; Height=&quot;480&quot;&gt;someValue&lt;/File&gt;&lt;File Width=&quot;320&quot; Height=&quot;240&quot;&gt;otherValue&lt;/File&gt;&lt;/Files&gt;&lt;/Video&gt;

huangapple
  • 本文由 发表于 2022年2月3日 20:17:29
  • 转载请务必保留本文链接：https://go.coder-hub.com/70971154.html
  • go
  • xml
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